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Shutemov" To: Borislav Petkov , Andy Lutomirski , Sean Christopherson , Andrew Morton , Joerg Roedel , Ard Biesheuvel Cc: Andi Kleen , Kuppuswamy Sathyanarayanan , David Rientjes , Vlastimil Babka , Tom Lendacky , Thomas Gleixner , Peter Zijlstra , Paolo Bonzini , Ingo Molnar , Dario Faggioli , Dave Hansen , Mike Rapoport , David Hildenbrand , Mel Gorman , marcelo.cerri@canonical.com, tim.gardner@canonical.com, khalid.elmously@canonical.com, philip.cox@canonical.com, aarcange@redhat.com, peterx@redhat.com, x86@kernel.org, linux-mm@kvack.org, linux-coco@lists.linux.dev, linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org, "Kirill A. Shutemov" Subject: [PATCHv9 04/14] mm/page_alloc: Add sysfs handle to accept accept_memory Date: Thu, 30 Mar 2023 14:49:46 +0300 Message-Id: <20230330114956.20342-5-kirill.shutemov@linux.intel.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230330114956.20342-1-kirill.shutemov@linux.intel.com> References: <20230330114956.20342-1-kirill.shutemov@linux.intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: ED186180006 X-Stat-Signature: qsn6yh4911yusp5bem11i9i5c78x6foz X-HE-Tag: 1680177027-653922 X-HE-Meta: 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 +T8tzw9X Ghm74bhh1/VX+u8A02wzRdiuhK5tDQGPfqC0cWUTZ3oiuB5V3Su4OvHBpTYPCdYPx3UX3at9hbF3mjaUM5G3LHXYsB4aOP6CXoXwwCozWGwyXU258HyIkNUBrf8K0zGa/SDFANCPjea4kze7u+h2y0MlDa8+T1cyYO26ywvRECdnQ60Et5j+B9zNdcgDyoiICBrMxKGgVJRmV9yc= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Write amount of memory to accept into the new sysfs handle /sys/kernel/mm/page_alloc/accept_memory. Write 'all' to the handle to accept all memory in the system. It can be used to implement background memory accepting from userspace. It is also useful for debugging. Signed-off-by: Kirill A. Shutemov --- mm/page_alloc.c | 64 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 64 insertions(+) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 509a93b7e5af..07e16e9b49c4 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -7343,6 +7343,45 @@ static bool __free_unaccepted(struct page *page) return true; } +static ssize_t accept_memory_store(struct kobject *kobj, + struct kobj_attribute *attr, + const char *buf, size_t count) +{ + unsigned long to_accept = 0; + struct zone *zone; + char *retptr; + + if (sysfs_streq(buf, "all")) { + to_accept = ULONG_MAX; + } else { + to_accept = memparse(buf, &retptr); + + /* Get rid of trailing whitespace, including '\n' */ + retptr = skip_spaces(retptr); + + if (*retptr != 0 || to_accept == 0) + return -EINVAL; + } + + for_each_populated_zone(zone) { + while (try_to_accept_memory_one(zone)) { + if (to_accept <= PAGE_SIZE << MAX_ORDER) + return count; + + to_accept -= PAGE_SIZE << MAX_ORDER; + } + } + + return count; +} + +static struct kobj_attribute accept_memory_attr = __ATTR_WO(accept_memory); + +static struct attribute *page_alloc_attr[] = { + &accept_memory_attr.attr, + NULL +}; + #else static bool page_contains_unaccepted(struct page *page, unsigned int order) @@ -7366,3 +7405,28 @@ static bool __free_unaccepted(struct page *page) } #endif /* CONFIG_UNACCEPTED_MEMORY */ + +static const struct attribute_group page_alloc_attr_group = { +#ifdef CONFIG_UNACCEPTED_MEMORY + .attrs = page_alloc_attr, +#endif +}; + +static int __init page_alloc_init_sysfs(void) +{ + struct kobject *page_alloc_kobj; + int err; + + page_alloc_kobj = kobject_create_and_add("page_alloc", mm_kobj); + if (!page_alloc_kobj) + return -ENOMEM; + + err = sysfs_create_group(page_alloc_kobj, &page_alloc_attr_group); + if (err) { + kobject_put(page_alloc_kobj); + return err; + } + + return 0; +} +late_initcall(page_alloc_init_sysfs); -- 2.39.2